cfg80211/nl80211: introduce key handling

This introduces key handling to cfg80211/nl80211. Default
and group keys can be added, changed and removed; sequence
counters for each key can be retrieved.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 370 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 538ee1dd3d0a..8dc807d9c29a 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -37,6 +37,16 @@
  *      userspace to request deletion of a virtual interface, then requires
  *      attribute %NL80211_ATTR_IFINDEX.
  *
+ * @NL80211_CMD_GET_KEY: Get sequence counter information for a key specified
+ *      by %NL80211_ATTR_KEY_IDX and/or %NL80211_ATTR_MAC.
+ * @NL80211_CMD_SET_KEY: Set key attributes %NL80211_ATTR_KEY_DEFAULT or
+ *      %NL80211_ATTR_KEY_THRESHOLD.
+ * @NL80211_CMD_NEW_KEY: add a key with given %NL80211_ATTR_KEY_DATA,
+ *      %NL80211_ATTR_KEY_IDX, %NL80211_ATTR_MAC and %NL80211_ATTR_KEY_CIPHER
+ *      attributes.
+ * @NL80211_CMD_DEL_KEY: delete a key identified by %NL80211_ATTR_KEY_IDX
+ *      or %NL80211_ATTR_MAC.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -54,6 +64,11 @@ enum nl80211_commands {
         NL80211_CMD_NEW_INTERFACE,
         NL80211_CMD_DEL_INTERFACE,
 
+        NL80211_CMD_GET_KEY,
+        NL80211_CMD_SET_KEY,
+        NL80211_CMD_NEW_KEY,
+        NL80211_CMD_DEL_KEY,
+
         /* add commands here */
 
         /* used to define NL80211_CMD_MAX below */
@@ -75,6 +90,17 @@ enum nl80211_commands {
  * @NL80211_ATTR_IFNAME: network interface name
  * @NL80211_ATTR_IFTYPE: type of virtual interface, see &enum nl80211_iftype
  *
+ * @NL80211_ATTR_MAC: MAC address (various uses)
+ *
+ * @NL80211_ATTR_KEY_DATA: (temporal) key data; for TKIP this consists of
+ *      16 bytes encryption key followed by 8 bytes each for TX and RX MIC
+ *      keys
+ * @NL80211_ATTR_KEY_IDX: key ID (u8, 0-3)
+ * @NL80211_ATTR_KEY_CIPHER: key cipher suite (u32, as defined by IEEE 802.11
+ *      section 7.3.2.25.1, e.g. 0x000FAC04)
+ * @NL80211_ATTR_KEY_SEQ: transmit key sequence number (IV/PN) for TKIP and
+ *      CCMP keys, each six bytes in little endian
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -89,6 +115,14 @@ enum nl80211_attrs {
         NL80211_ATTR_IFNAME,
         NL80211_ATTR_IFTYPE,
 
+        NL80211_ATTR_MAC,
+
+        NL80211_ATTR_KEY_DATA,
+        NL80211_ATTR_KEY_IDX,
+        NL80211_ATTR_KEY_CIPHER,
+        NL80211_ATTR_KEY_SEQ,
+        NL80211_ATTR_KEY_DEFAULT,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index d30960e1755c..3db7dfa53b6f 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -49,6 +49,26 @@ extern int ieee80211_radiotap_iterator_next(
    struct ieee80211_radiotap_iterator *iterator);
 
 
+ /**
+ * struct key_params - key information
+ *
+ * Information about a key
+ *
+ * @key: key material
+ * @key_len: length of key material
+ * @cipher: cipher suite selector
+ * @seq: sequence counter (IV/PN) for TKIP and CCMP keys, only used
+ *      with the get_key() callback, must be in little endian,
+ *      length given by @seq_len.
+ */
+struct key_params {
+        u8 *key;
+        u8 *seq;
+        int key_len;
+        int seq_len;
+        u32 cipher;
+};
+
 /* from net/wireless.h */
 struct wiphy;
 
@@ -71,6 +91,18 @@ struct wiphy;
  *
  * @change_virtual_intf: change type of virtual interface
  *
+ * @add_key: add a key with the given parameters. @mac_addr will be %NULL
+ *      when adding a group key.
+ *
+ * @get_key: get information about the key with the given parameters.
+ *      @mac_addr will be %NULL when requesting information for a group
+ *      key. All pointers given to the @callback function need not be valid
+ *      after it returns.
+ *
+ * @del_key: remove a key given the @mac_addr (%NULL for a group key)
+ *      and @key_index
+ *
+ * @set_default_key: set the default key on an interface
  */
 struct cfg80211_ops {
         int     (*add_virtual_intf)(struct wiphy *wiphy, char *name,
@@ -78,6 +110,18 @@ struct cfg80211_ops {
         int     (*del_virtual_intf)(struct wiphy *wiphy, int ifindex);
         int     (*change_virtual_intf)(struct wiphy *wiphy, int ifindex,
                                        enum nl80211_iftype type);
+
+        int     (*add_key)(struct wiphy *wiphy, struct net_device *netdev,
+                           u8 key_index, u8 *mac_addr,
+                           struct key_params *params);
+        int     (*get_key)(struct wiphy *wiphy, struct net_device *netdev,
+                           u8 key_index, u8 *mac_addr, void *cookie,
+                           void (*callback)(void *cookie, struct key_params*));
+        int     (*del_key)(struct wiphy *wiphy, struct net_device *netdev,
+                           u8 key_index, u8 *mac_addr);
+        int     (*set_default_key)(struct wiphy *wiphy,
+                                   struct net_device *netdev,
+                                   u8 key_index);
 };
 
 #endif /* __NET_CFG80211_H */
diff --git a/net/wireless/core.c b/net/wireless/core.c
index febc33bc9c09..cfc5fc5f9e75 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -184,6 +184,9 @@ struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
         struct cfg80211_registered_device *drv;
         int alloc_size;
 
+        WARN_ON(!ops->add_key && ops->del_key);
+        WARN_ON(ops->add_key && !ops->del_key);
+
         alloc_size = sizeof(*drv) + sizeof_priv;
 
         drv = kzalloc(alloc_size, GFP_KERNEL);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 48b0d453e4e1..090936388528 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -61,6 +61,14 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
         [NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
         [NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
         [NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
+
+        [NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
+
+        [NL80211_ATTR_KEY_DATA] = { .type = NLA_BINARY,
+                                    .len = WLAN_MAX_KEY_LEN },
+        [NL80211_ATTR_KEY_IDX] = { .type = NLA_U8 },
+        [NL80211_ATTR_KEY_CIPHER] = { .type = NLA_U32 },
+        [NL80211_ATTR_KEY_DEFAULT] = { .type = NLA_FLAG },
 };
 
 /* message building helper */
@@ -335,6 +343,263 @@ static int nl80211_del_interface(struct sk_buff *skb, struct genl_info *info)
         return err;
 }
 
+struct get_key_cookie {
+        struct sk_buff *msg;
+        int error;
+};
+
+static void get_key_callback(void *c, struct key_params *params)
+{
+        struct get_key_cookie *cookie = c;
+
+        if (params->key)
+                NLA_PUT(cookie->msg, NL80211_ATTR_KEY_DATA,
+                        params->key_len, params->key);
+
+        if (params->seq)
+                NLA_PUT(cookie->msg, NL80211_ATTR_KEY_SEQ,
+                        params->seq_len, params->seq);
+
+        if (params->cipher)
+                NLA_PUT_U32(cookie->msg, NL80211_ATTR_KEY_CIPHER,
+                            params->cipher);
+
+        return;
+ nla_put_failure:
+        cookie->error = 1;
+}
+
+static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
+{
+        struct cfg80211_registered_device *drv;
+        int err;
+        struct net_device *dev;
+        u8 key_idx = 0;
+        u8 *mac_addr = NULL;
+        struct get_key_cookie cookie = {
+                .error = 0,
+        };
+        void *hdr;
+        struct sk_buff *msg;
+
+        if (info->attrs[NL80211_ATTR_KEY_IDX])
+                key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
+
+        if (key_idx > 3)
+                return -EINVAL;
+
+        if (info->attrs[NL80211_ATTR_MAC])
+                mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
+
+        err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
+        if (err)
+                return err;
+
+        if (!drv->ops->get_key) {
+                err = -EOPNOTSUPP;
+                goto out;
+        }
+
+        msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+        if (!msg) {
+                err = -ENOMEM;
+                goto out;
+        }
+
+        hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
+                             NL80211_CMD_NEW_KEY);
+
+        if (IS_ERR(hdr)) {
+                err = PTR_ERR(hdr);
+                goto out;
+        }
+
+        cookie.msg = msg;
+
+        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
+        NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, key_idx);
+        if (mac_addr)
+                NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
+
+        rtnl_lock();
+        err = drv->ops->get_key(&drv->wiphy, dev, key_idx, mac_addr,
+                                &cookie, get_key_callback);
+        rtnl_unlock();
+
+        if (err)
+                goto out;
+
+        if (cookie.error)
+                goto nla_put_failure;
+
+        genlmsg_end(msg, hdr);
+        err = genlmsg_unicast(msg, info->snd_pid);
+        goto out;
+
+ nla_put_failure:
+        err = -ENOBUFS;
+        nlmsg_free(msg);
+ out:
+        cfg80211_put_dev(drv);
+        dev_put(dev);
+        return err;
+}
+
+static int nl80211_set_key(struct sk_buff *skb, struct genl_info *info)
+{
+        struct cfg80211_registered_device *drv;
+        int err;
+        struct net_device *dev;
+        u8 key_idx;
+
+        if (!info->attrs[NL80211_ATTR_KEY_IDX])
+                return -EINVAL;
+
+        key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
+
+        if (key_idx > 3)
+                return -EINVAL;
+
+        /* currently only support setting default key */
+        if (!info->attrs[NL80211_ATTR_KEY_DEFAULT])
+                return -EINVAL;
+
+        err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
+        if (err)
+                return err;
+
+        if (!drv->ops->set_default_key) {
+                err = -EOPNOTSUPP;
+                goto out;
+        }
+
+        rtnl_lock();
+        err = drv->ops->set_default_key(&drv->wiphy, dev, key_idx);
+        rtnl_unlock();
+
+ out:
+        cfg80211_put_dev(drv);
+        dev_put(dev);
+        return err;
+}
+
+static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
+{
+        struct cfg80211_registered_device *drv;
+        int err;
+        struct net_device *dev;
+        struct key_params params;
+        u8 key_idx = 0;
+        u8 *mac_addr = NULL;
+
+        memset(&params, 0, sizeof(params));
+
+        if (!info->attrs[NL80211_ATTR_KEY_CIPHER])
+                return -EINVAL;
+
+        if (info->attrs[NL80211_ATTR_KEY_DATA]) {
+                params.key = nla_data(info->attrs[NL80211_ATTR_KEY_DATA]);
+                params.key_len = nla_len(info->attrs[NL80211_ATTR_KEY_DATA]);
+        }
+
+        if (info->attrs[NL80211_ATTR_KEY_IDX])
+                key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
+
+        params.cipher = nla_get_u32(info->attrs[NL80211_ATTR_KEY_CIPHER]);
+
+        if (info->attrs[NL80211_ATTR_MAC])
+                mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
+
+        if (key_idx > 3)
+                return -EINVAL;
+
+        /*
+         * Disallow pairwise keys with non-zero index unless it's WEP
+         * (because current deployments use pairwise WEP keys with
+         * non-zero indizes but 802.11i clearly specifies to use zero)
+         */
+        if (mac_addr && key_idx &&
+            params.cipher != WLAN_CIPHER_SUITE_WEP40 &&
+            params.cipher != WLAN_CIPHER_SUITE_WEP104)
+                return -EINVAL;
+
+        /* TODO: add definitions for the lengths to linux/ieee80211.h */
+        switch (params.cipher) {
+        case WLAN_CIPHER_SUITE_WEP40:
+                if (params.key_len != 5)
+                        return -EINVAL;
+                break;
+        case WLAN_CIPHER_SUITE_TKIP:
+                if (params.key_len != 32)
+                        return -EINVAL;
+                break;
+        case WLAN_CIPHER_SUITE_CCMP:
+                if (params.key_len != 16)
+                        return -EINVAL;
+                break;
+        case WLAN_CIPHER_SUITE_WEP104:
+                if (params.key_len != 13)
+                        return -EINVAL;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
+        if (err)
+                return err;
+
+        if (!drv->ops->add_key) {
+                err = -EOPNOTSUPP;
+                goto out;
+        }
+
+        rtnl_lock();
+        err = drv->ops->add_key(&drv->wiphy, dev, key_idx, mac_addr, &params);
+        rtnl_unlock();
+
+ out:
+        cfg80211_put_dev(drv);
+        dev_put(dev);
+        return err;
+}
+
+static int nl80211_del_key(struct sk_buff *skb, struct genl_info *info)
+{
+        struct cfg80211_registered_device *drv;
+        int err;
+        struct net_device *dev;
+        u8 key_idx = 0;
+        u8 *mac_addr = NULL;
+
+        if (info->attrs[NL80211_ATTR_KEY_IDX])
+                key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
+
+        if (key_idx > 3)
+                return -EINVAL;
+
+        if (info->attrs[NL80211_ATTR_MAC])
+                mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
+
+        err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
+        if (err)
+                return err;
+
+        if (!drv->ops->del_key) {
+                err = -EOPNOTSUPP;
+                goto out;
+        }
+
+        rtnl_lock();
+        err = drv->ops->del_key(&drv->wiphy, dev, key_idx, mac_addr);
+        rtnl_unlock();
+
+ out:
+        cfg80211_put_dev(drv);
+        dev_put(dev);
+        return err;
+}
+
 static struct genl_ops nl80211_ops[] = {
         {
                 .cmd = NL80211_CMD_GET_WIPHY,
@@ -374,6 +639,30 @@ static struct genl_ops nl80211_ops[] = {
                 .policy = nl80211_policy,
                 .flags = GENL_ADMIN_PERM,
         },
+        {
+                .cmd = NL80211_CMD_GET_KEY,
+                .doit = nl80211_get_key,
+                .policy = nl80211_policy,
+                .flags = GENL_ADMIN_PERM,
+        },
+        {
+                .cmd = NL80211_CMD_SET_KEY,
+                .doit = nl80211_set_key,
+                .policy = nl80211_policy,
+                .flags = GENL_ADMIN_PERM,
+        },
+        {
+                .cmd = NL80211_CMD_NEW_KEY,
+                .doit = nl80211_new_key,
+                .policy = nl80211_policy,
+                .flags = GENL_ADMIN_PERM,
+        },
+        {
+                .cmd = NL80211_CMD_DEL_KEY,
+                .doit = nl80211_del_key,
+                .policy = nl80211_policy,
+                .flags = GENL_ADMIN_PERM,
+        },
 };
 
 /* multicast groups */